How to get the season number (0 ~ 3) from a month number (1 ~ 12) - only for the north hemisphere

monthNum_to_SeasonNum.java

// What you need to input: a month number (1~12)
// What you will get: 0 is winter, 1 is spring, 2 is summer, 3 is autumn
private static String getSeasonName(int m) { return new String[]{ "Winter", "Spring", "Summer", "Autumn" }[m / 3 % 4]; }

// Let's convert each month number to the season string
for(int m = 1; m <= 12; m++) System.out.printf("%2d → %s", i, getSeasonName(m) + "\n");

/*
[[result]]
 1 → Winter
 2 → Winter
 3 → Spring
 4 → Spring
 5 → Spring
 6 → Summer
 7 → Summer
 8 → Summer
 9 → Autumn
10 → Autumn
11 → Autumn
12 → Winter
*/